Our webhost informed us that we have been sending ridiculous amounts of emails from this site. They traced the problem back to new users creating accounts and spamming users through private messages.

The site's registration form already has CAPTCHA, so I can only assume that they've hired people to create accounts or they have really good CAPTCHA recognition software. Either way, and as a stop-gap measure, I've imposed limits on the number of private messages you may send.

Please note that these limits should be considered a temporary measure until a more permanent policy is decided.